.dh{
    text-align: center;
    font-size: 16px;
    margin-right: 50px;
}
.dh img{
    margin-right: 200px;
    margin-bottom: -10px;
}
.dh span{
    margin-left: 10px;
}
.bt{
    background-color: #f8f8f8;
}
.bt div{
    margin-left: 150px;
}
.nr{
    width: 70%;
    background-color: #f8f8f8;
    margin-left: 15%;
}
.xw{
    margin-left: 30px;
    background-color: #f8f8f8;
}
.xw div img{
    width: 400px;
}
.xw1{
   width: 30%;
   float: left;
}
.xw2{
    width: 30%;
   float: left;
   margin-left: 30px;
}
.xw3{
    width: 30%;
   float: left;
   margin-left: 30px;
}
.xia{
    margin-left: 30px;
    text-align: center;
}
.xia table{
    margin-left: 140px;   
    width: 90%;
    height: 100px;
    font-size: 12px;
}